The meaning of Fly in the Bible
(From Easton's Bible Dictionary)

Heb. zebub, (Eccl 10:1; Isaiah 7:18). This fly was so grievous a pest that the Phoenicians invoked against it the aid of their god Baal-zebub (q.v.). The prophet (Isaiah 7:18) alludes to some poisonous fly which was believed to be found on the confines of Egypt, and which would be called by the Lord. Poisonous flies exist in many parts of Africa, for instance, the different kinds of tsetse.

See more on the meaning of Fly in the Bible:
Fly {International Standard Bible Encyclopedia}

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